Does SetupDiGetClassDevs work with device instance IDs as documented?

It seems you have to either specify the DIGCF_ALLCLASSES flag to find all classes that match the given device instance id, or else specify the ClassGuid and use the DIGCF_DEFAULT flag.

This worked for me:

void error(DWORD err){    WCHAR buf[0x200];    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err, 0, buf, 0x200, NULL);    wprintf(L"%x: %s\n", err,  buf);}int _tmain(int argc, _TCHAR* argv[]){    PCWSTR devinst = L"HID\\VID_413C&PID_2105\\6&22CE0F66&0&0000";    HDEVINFO hinfo = SetupDiGetClassDevs(NULL, devinst, NULL, DIGCF_DEVICEINTERFACE | DIGCF_ALLCLASSES);    if (hinfo == INVALID_HANDLE_VALUE)    {        error(GetLastError());        return 1;    }    SP_DEVINFO_DATA dinfo;    dinfo.cbSize = sizeof(dinfo);    int ix = 0;    while (SetupDiEnumDeviceInfo(hinfo, ix++, &dinfo))    {        wprintf(L"Match\n");    }    error(GetLastError());    SetupDiDestroyDeviceInfoList(hinfo);    return 0;}

With output:

Match103: No more data is available.

It seems that you're misunderstanding DBT_DEVICEARRIVAL.

There are a few different types of DBT_DEVICEARRIVAL messages-- for a volume, for a handle, for a device interface. I'm guessing you're talking about the DBT_DEVTYP_DEVICEINTERFACE variety. In this case, the dbcc_name field of the DEV_BROADCAST_DEVICEINTERFACE structure will contain the "device interface path".

The "device interface path" is NOT the same as a "device instance ID".

If you want to know more information about this device, you should enumerate all device interfaces by this device interface GUID (through SetupDiGetClassDevs with DIGCF_DEVICEINTERFACE), and compare the dbcc_name to the strings retrieved by SetupDiEnumDeviceInterfaces.